Human Ancestors

Homo erectus was first found in Africa and the fossilized remains dated 1.8 and 1.0 million years old. The Homo erectus traits are very similar toward the modern human traits. Homo erectus brain size was smaller than the Homo sapiens. Homo erectus had a brain size of approximately 650 cc and Homo sapiens had a brain size of approximately 1251

Despite the evolutionary many benefits and gradient expenses with human intelligence, increased brain size did not occur because it was able to expand by itself. Environmental factors are what led to the evolutionary changes. A fundamental principle of evolutionary theory is that evolution is the balanced outcome between costs and benefits. Since the price of maintaining a large brain is greater, it is inherently improbably that expansion of the brain will evolve without a selection factor being adequate to overcome the high expenses. (Dunbar, 2007) There has been a strong correlation between increased temperatures in the global climate and increased endocranial volume. Over the past three million years, the average global temperature has been steadily increasing, as well as the braincase of human ancestors. Strong evidence of this is seen between the period approximately 200,000 to 800,000 years ago where the Earth’s climate experienced the greatest temperature fluctuations which

The most recent ancestor to the modern human, Homo neanderthalensis existed between 300,000 and 35,000 years ago. Originating in Africa, ancestors of the early Neanderthals migrated northwards almost 800,000 years ago. These migrants colonized much of the Old World with the majority based in Europe and small groups scattered throughout the Middle East and Asia. Historically, the Neanderthals were among the most resiliant creatures to exist on Earth. As a population, they thrived during the European ice age 40,000 years ago. This ice age enveloped the majority of Northern and Central Europe and due to their physique were the Neanderthals were able to surive. Physcially, the Neanderthals were larger and more muscular than today’s human

By age two the brain has developed to two-thirds of what it will weigh by adulthood and has increased to five times the density it was at birth.

That meant that there were more calories available for larger brains, which of course was an evolutionary advantage. It also took much much less time to eat, leaving time to hunt, socialize and form tribes and communities, and procreate.

Another trait seen in primate evolution has been a more elaborate brain. In addition to brain size and gestation periods, the social organization also demonstrates and plays an important role in primate evolution due to its complexity and hierarchy. Brain evolution The fundamental explanation for the evolution of large relative brain size in early primates remains undetermined and disputed (Insel).

One of the main reasons why we are so interested in the other primates is that by looking at them we can obtain some ideas of what our ancestor must have been like a few millions years ago. Even though, we are not descended from any modern-type monkey or ape, our lineage does appear to have gone through stages in which we were a medium-sized, reasonably intelligent creature with good binocular vision, hands that were good at manipulation and the ability to climb trees. An evolutionary trend in primates involves the development of offspring both before and after birth and their integration into complex social systems. Another trend in primate evolution has been toward a more elaborate brain. In addition to brain size and gestation periods,

Despite this, they were very similar to ours. Endocasts from Neanderthal skulls have shown very similar frontal lobes, so much so that it’s difficult to tell the different between a Neanderthal and modern Homo sapiens one. 3-D images of a Neanderthal skull is low and elongated, unlike our which is dome-like. This could possibly show the shape of the brain. Also, some parts of the Neanderthal brains were smaller than ours, such as the parietal and temporal lobes, which could have an impact on their cognition, especially regarding language, memory, and spatial

Neanderthals are the predecessor to anatomically modern humans. They were hunters, cared for their wounded and the dead, lived rough lives, and are considered to be a highly successful species (who). Living between 180-40 thousand years ago, Neanderthals were considered to be a part of the middle paleolithic era (when). Living in both Europe and southern Asia, Neanderthals never migrated into Africa (where). They co-existed with anatomically modern humans; however the time of coexistence is debatable. Unlike today’s humans, they had a significantly larger head, accounting for a significantly larger brain (what). However, they were equipped with a much smaller frontal lobe, which means they had less capacity and ability for forethought. They

We, the human species are unique. This is a phrase we all have heard at some point in our lives. We are "unique" compared to other animals in our language, movements, and emotions. We have our own language which the majority of animals do not, we stand on two legs while the majority of the animals are on four legs, and we are much more sensitive to our emotional reactions, making us complex animals. Now, where does all these differences come from? As the title suggest, our human brains are incredible in the way they process information. This article aims to discuss the differences of human brain compared to other animal brains, and what makes us humans so unique in our responsive reactions in how we process information. More specifically, this paper will examine the influences the environment has on our human brains and how the changing environment influences our brain evolution in how we respond.

In the documentary scientists aim to answer which one from Lucy all the way to Kenyanthropus platyops led to humans, they all exhibited bipedalism and chimp sized brains. The scientists explained the one key difference is the length of the childhood between apes and humans. They know that chimps are fully development by 3 years of age, while in humans the growth is slow, taking up to 2 decades to fully develop. Scientists argued that this change in climate pushed the brain to grow. Better problem solvers like Homo habilis survived, whereas A. afarensis died out. Our ancestors adapted to change, propelling us to where we are today – wonderful creatures of climate

Understanding human evolutions is important for identifying the stages of humanity and for understanding how our societies have developed. When most of us think about human

An Oxford University research team looked at how 500 species, both living and fossilized, have evolved over about 60 million years. The ones that lived in social groups had much larger brains, relative to body size, than those species that tend to be self-sufficient.

The next species to appear were the Homo erectus which might have descended from Homo habilis. They were the first human whose fossils were found outside of Africa. They also had larger brain than the species before them. Homo sapiens sapiens came after the Homo Neanderthalensis; they are the only human species around. This could have been due to the result of increase brain sizes that allows more cognitive abilities that help them adapt to different environment changes and hence survive. Global evidence have been found of art, music, and culture and advanced tool making. In Mithen’s 3 phase of mind proposes that the shape of the Neanderthals’ frontal lobe was similar to the one of the modern Homo sapiens and this indicated that they were able to cope with complex cognitive functioning. Evidence for this could be explained using the phonological approach by Frank Gall (1758-1828).

Hominids with a brain absolutely and relatively larger than that of the australopithecines appeared about 2.3 million years ago. These hominids are classified in our own genus: Homo. The earliest species to appear was the Homo Habilis. It was the first of our ancestors to show a significant increase in brain size and also the first to be found associated with stone tools. These characteristics resulted in this species’ placement into the human genus, Homo.